<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">权限管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 一行一列添加角色区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolesList" border stripe>
        // 展开
        <el-table-column type="expand">
          <template v-slot="$scopedSlots">
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in $scopedSlots.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag type="danger" :closable="true"
                 @close="removeRightById($scopedSlots.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限和三级权限 -->
              <el-col :span="19">
                <!-- 通过v-for循环嵌套二级权限 -->
                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="warning" :closable="true"
                     @close="removeRightById($scopedSlots.row, item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag style="margin-left: 10px;"
                     v-for="(item3) in item2.children"
                      :key="item3.id"
                      :closable="true"
                      @close="removeRightById($scopedSlots.row, item3.id)">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- 渲染纯数据 -->
<!--            <pre>
              {{$scopedSlots.row}}
            </pre> -->
          </template>
        </el-table-column>
        <el-table-column type="index" label="ID"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色名称" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="danger" icon="el-iconedit">编辑</el-button>
            <el-button size="mini" type="warning" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="primary" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限的对话框 -->
    <el-dialog
  title="分配权限"
  :visible.sync="setRightDialogVisble"
  width="50%" @close="setRightDialogClosed">
  <!-- 树形控件 -->
  <el-tree :data="rightslist" :props="treeProps" :show-checkbox="true" node-key="id"
   ref="treeRef"
   :default-expand-all="true" :default-checked-keys="defKeys"></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisble = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 获取角色列表
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisble: false,
      // 所有权限的数据默认为空
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认选中的节点的Id值数组
      defKeys: [],
      // 当前即将分配权限的角色Id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取用户失败')
      }
      this.rolesList = res.data
      // console.log(this.rolesList)
    },
    // 根据Id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否要删除
      const confirmRuselt = await this.$confirm('此操作将永久删除该权限, 是否继续？',
        '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
      if (confirmRuselt !== 'confirm') {
        return this.$message.info('操作已取消')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      // 调用会刷新不建议使用
      // this.getRolesList()
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      // 为allotRights方法中post请求提供roleId
      this.roleId = role.id
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据权限失败')
      }
      this.rightslist = res.data
      // console.log(this.rightslist)

      // 递归调用获取三级节点的Id
      this.getLeafKeys(role, this.defKeys)

      this.setRightDialogVisble = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id
    // 并保存到 defKeys 数组中
    getLeafKeys(node, arr) {
      // if判断当前node节点，包不包含children属性
      // 不包含则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    // 清空defKeys[]数组
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys)
      const idStr = keys.join(',')
      const { data: res } =
       await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      // 刷新
      this.getRolesList()
      this.setRightDialogVisble = false
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin-top: 10px;
    margin-bottom: 10px;
  }
  .bdtop {
    border-top: 1px solid #eee;
  }
  .bdbottom {
    border-bottom: 1px solid #eee;
  }
  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
